#!/bin/bash

# Internal Initialization

source "${DIP_FUNCTIONS}"

if [[ -r "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_NAME}.conf" ]]; then
    source "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_NAME}.conf"
fi

if [[ -r "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_EXEC}.conf" ]]; then
    source "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_EXEC}.conf"
fi

if [[ -z "$DIP_CUR_IP" ]] || [[ -z "$DIP_OLD_IP" ]] || [[ -z "$DIP_RECORD" ]] || [[ -z "$DIP_DOMAIN" ]]; then
    logerr "ERROR: Agent expects currentip, existingip, record and domain."
    exit 98
fi

# Get Host and Domain Name

_get_host_and_domain() {
    local record=$1
    local domain=$2
    local hostname

    if [[ -z "$record" ]] || [[ -z "$domain" ]]; then
        return 1
    fi

    hostname="${record%%."$domain"}"

    if [[ -n "$hostname" ]]; then
        DIP_RECORD="$hostname"
    else
        return 1
    fi

    #hostname=${record%%.*}
    #hostname="${record%%."$domain"}"
    #domain=${record#*.}

    if [[ -n "${agent_update_dns_namecheap_token[$domain]}" ]]; then
        DIP_TOKEN="${agent_update_dns_namecheap_token["$domain"]}"
        return 0
    else
        logerr "ERROR: Password for '$domain' not found in agent configuration."
        return 1
    fi
}

# Update and Check Response

_update_dns_namecheap() {
    local rec=$1
    local dom=$2
    local pas=$3
    local ip=$4
    local result
    local errors

    if result=$(curl -qs "https://dynamicdns.park-your-domain.com/update?host=${rec}&domain=${dom}&password=${pas}&ip=${ip}" | grep ErrCount); then
        errors=$(grep -oPm1 "(?<=<ErrCount>)[^<]+" <<< "$result")

        if [[ "$errors" -eq 0 ]]; then
            echo "DNS record ${rec}.${dom} updated successfully."
            return 0
        else
            echo "DNS record ${rec}.${dom} failed to update."
            return 96
        fi
    else
        echo "Failed to update DNS Record"
        return 95
    fi
}

# Main

_get_host_and_domain "$DIP_RECORD" "$DIP_DOMAIN" || exit 99

if valid_ipv4 "$DIP_CUR_IP"; then
    log "Updating Namecheap DNS IPv4 Record for ${DIP_RECORD}.${DIP_DOMAIN}"
    _update_dns_namecheap "$DIP_RECORD" "$DIP_DOMAIN" "$DIP_TOKEN" "${DIP_CUR_IP}"
    unset DIP_TOKEN
    exit $?
fi

if valid_ipv6 "$DIP_CUR_IP"; then
    log "Updating Namecheap DNS IPv6 Record for ${DIP_RECORD}.${DIP_DOMAIN}"
    _update_dns_namecheap "$DIP_RECORD" "$DIP_DOMAIN" "$DIP_TOKEN" "${DIP_CUR_IP}"
    unset DIP_TOKEN
    exit $?
fi